someone or something abnormal, uncoodernated and silly. probably incabable of doing simple actions like thorwing a ball or just walking without making a fool of themsleves.

walking into a wall and then appolagising to the wall
tripping over nothing but air
falling up the stairs
thinking emus are soon going to take over the world
in reaction to any of these happening onlookers would say: what a gumby!

1.A hair style originated from an green claymation character. 2.A hair stlye that sort of resembles a flat top but leans to either the left or right,commonly mistakin for the slop which gadually gets longer from the back to the front.
Also seen in the movie juice with Tupac, (he had a serious gumby in that movie. Also seen worn by R&B/RAP artist from the early 90's

guy1: i think its time for hair cut son..
guy2: true
guy1: i'm a get the gumby yo!
guy2: man that shit is wack son!